mfd: max77686: Remove unused struct max77686_opmode_data

The defined struct max77686_opmode_data isn't used neither by
the max77686 mfd driver nor the drivers for its sub-devices.

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Reviewed-by: Chanwoo Choi <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

include/linux/mfd/max77686.h

···
 	MAX77686_OPMODE_STANDBY,
 };
 
-struct max77686_opmode_data {
-	int id;
-	int mode;
-};
-
 #endif /* __LINUX_MFD_MAX77686_H */